Sample Cases

Petro-SIM ships with several sample cases. Click on the "Open Sample Case" button on the button bar (or click File, Open, Sample Case) to load a sample case. This section contains a brief description and comments on these cases.

Dynamics Debutanizer

This case demonstrates modeling a distillation column with more detail around the condenser. Column pressure control is handled by bypassing some of the overhead vapor around the condenser. PIC-101 controls the overhead accumulator pressure using the bypass. The top tray pressure is controlled by PIC-100, which essentially maintains a constant pressure drop between the top tray and the overhead accumulator. If the system overpressures, PIC-102 will vent to flare.

The reflux rate is on flow control, with the overhead accumulator level being controlled by the product rate. There is temperature control at the bottom of the column, and level control for the sump.

Additional item(s) which could be modeled are relief valves - probably one at the top of the column, and one for the overhead accumulator. The bottom product could be put on analyzer control, cascaded to the temperature control.

Dynamics Ethanol Dehydrator

This simulation demonstrates a simplified dynamic simulation of a three-phase chemical column. In this example, all of the organic phase from the decanter is refluxed to the column. In addition, a small amount of the aqueous phase is refluxed to maintain temperature control at the top of the column (TIC-100). The amount of aqueous reflux is insufficient to produce a second liquid phase on the trays.

Dynamic Glycol Reactor

This model simulates a glycol reactor with level and temperature control.

Dynamics Crude Distillation

This crude column distillation model was adapted from a standard steady state sample case Standard CDU.ksc. The flowsheet has been kept as close to the steady state flowsheet as possible. Because of this, for instance, there are no column sumps, except for the reboiled sidestripper. The case also does not utilize static head contributions and the control scheme is incomplete.

A model which is expected to go through startup and shutdown calculations will likely contain additional controls and details not included in this model.

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